That might be a legitimate concern, but the same is true for most clubs and the situation is far from bleak. I'd only start to worry if Modric & Bale leave and aren't replaced....will they be able to invest in their squad to maintain their challenge for a CL spot over the next few years.
No club has been able to compete with the crazy spending of Chelsea & Man City, the best to hope for is that FFP reigns them in and something sort of balance is restored to football. Chelsea's bubble hasn't exactly burst, but it looks like it's slowly deflating.
I think we all have to accept that Man Utd are going to continue to be at or near the top, and we all have to accept that City are going to be very strong for a while to come.
Despite Arsenals apparently strong financial status, their squad doesn't look unbeatable and they might've finished 5th. Unless they break with recent history and spend some money I don't see them being stronger next season.
I don't believe Liverpool or Newcastle have huge amounts of money to spend in the transfer market, and Everton certainly don't, so Spurs are in an OK position against those clubs.
The Spurs squad that had a 10pt lead for 3rd hasn't suddenly become rubbish, the right new manager will motivate them again. Clear out the deadwood and it may only take a couple of astute signings and the outlook would be a lot happier.
Going forward it looks like there no need to be overly pessimistic. Sure expectations have to be realistic - it is likely going to be a very tough, competitive season for those teams realistically looking at possible 3rd & 4th place finishes, but at least for the fans of those five clubs most likely to challenge there is reason to feel optimistic, and that include Spurs.
clubs have to be compliant with FFP to be allowed to participate, so finishing 3rd/4th is moot if your club just made an obscene loss?? FFP applies to teams in the CL, nothing to do with Spurs