I disagree, there is space in the market for both IMO and there are several things wrong in your post.
Their self driving tech is clearly is the best you can get in a car you can buy today.
Their drive train is the best on the market (for an EV). Their old tech in the Model S/X is still better than what Mercedes are putting in the EQC which isn't launching until 2019. The drive train in the Model 3 is next level in terms of both price and performance.
The one thing you are correct on is their interior isn't up to snuff on the S/X. The Model 3 on the other hand is very comparable to other cars in its class.
While cars like the EQC have better interiors they have also some shortcomings as an EV. Its designed to be manufactured on an ICE manufacturing line which compromises the drive train. The front motor is mounted really high up, as is the cooling system. This means it has a huge draggy front grill, huge bonnet and no frunk which is killing its efficiency. It's rumoured to only get 200 miles range (EPA) from an 80KW battery pack which is very poor. Its also a bit sluggish compared to the competition, 110mph max speed and 5 seconds 0-60.
Pretty much everyone is 5 years behind Tesla when it comes to high speed charging infrastructure and the way customers interact with it.
While I disagree as well that Tesla will go kaput, their self driving tech is not much better than that seen in BMW, Audi, Volvo and to an extent Nissan - most of who are backed by Mobileye, who Tesla used to use before going in house. Their current in house production is only now getting to the functionality stage available with the Mobileye tech they used a few years ago. There's a lot of talk, but in reality there's really not much in it. Audi for example have Level 3 tech on the market, Tesla are currently only level 2.
The ECQ is predicted to have a 220 mile EPA range (the 200 mile range was from a MB US press release, which was rescinded, Mercedes Germany say is range is 450km NEDC, which is actually more than the Model X), which is pretty much in line with the 237mile Model X 75D, so really not that much in it. This whole "frunk" thing is really pointless as most are only big enough to store a charging cable, it's certainly not something to decide on a car over, unless you're the type of person that would buy an XC40 because you can fit a laptop in the doors...
Top speed is electronically limited, and besides, what's the point unless you use German autobahns regularly? As long as it can accelerate to 90 easily it's not an issue for most drivers. 0-60 is 4.9 seconds, which coincidentally is the same as the 75D - both are slower than the I Pace. Presumably you're not comparing an SUV with a saloon?
That's not to say it's not more inefficient than the Tesla, it appears to be so, but it's not that far off. It would be interesting to see how much the aerodynamics are actually affecting that. Tesla have essentially forsaken design for aerodynamics and thus range, while the other manufacturers appear to be forsaking a little range for design - usually keeping their standard design cues. It's up to customers to decide which they prefer.
Honestly not sure what you mean by an "ICE manufacturing line". There retooling a factory yes, but it's not like the design is based on the factory it's being built in. The chassis and panels are different so tooling will be designed from scratch anyway, like any other vehicle. As far as I'm aware the platform itself is built specifically for BEVs.
The charging infrastructure is right, but I think considering the huge amount of money being put in by the established manufacturers the supercharger network is going to look sub par in just a few years. Obviously not something to put significant weight into buying an EV now, but certainly something to think about.*
* VW and Ionity plan to have 400 locations in Europe by 2020, and VW through Electrify America are investing billions (in part because of dieselgate) into chargers in the US where they are planning on installing close to 1000 charging locations a year (with multiple chargers at each) - a significant amount of those being 350kw. They've already installed about 40, and are working on several hundred more, with around 900 done by the middle of next year. To put that into perspective Tesla have around 900 supercharging locations in the US. They're also doing a much smaller rollout in Canada, but will likely equal the number of superchargers by 2020ish (I.e. 18 months). All the systems are using CCS which means that just about eve EV except Tesla can use them. Hopefully the Ionity and Electrify Canada systems will expand faster as time goes on.