did anyone seriously think that Sony would release the PS3 sans rumble...
Seriously though, if the company has the patent and there is no prior art (this is an important bit*), and can show that the method Sony are using to produce Blu-ray disks infringes on the patent then yes, Sony could be forced to either licence it, pull blu-ray disks from the market, or come up with some other method of making them (IIRC the patent covers one, cheaper method of making the disks so Sony would probably have the option of spending an extra penny or so per disk to use the alternate method).
Some lawsuits are silly, others have a good grounding in reality and a valid patent case is more the latter than the former (without patents there would be no reason for any company to invest in R&D, and whilst the system can be abused there are a number of safe guards built into it).
*Basically if Sony could show they, or indeed anyone else had produced disks using a close enough method to the one described in the patent, before the patent had been filed they will win the case fairly easily.
It's the reason you never demonstrate something before you have the patents in place, as someone else can then copy the idea and get it into the public before any patent is filed - thus nullifying your patent attempts. It's also the reason Imersion didn't sue nintendo at the same time they sued Sony and MS, Nintendo had created a similar (but slightly different) tech for rumble at about the same time, and thus the outcome of any legal action was very uncertain.