Rules and assurances will come into effect because of this but some registries also dropped their prices massively (Boston Ivy). I think even a slash in prices doesn't help maintain customer confidence either.
At the end of the day, the registries who provide the guarantees and stable and reasonable pricing are the ones that will stick around and grow and possibly thrive.
I used to have lots of .co.uk's and the introduction of .uk really kicked the aftermarket. I'm down to 30 .co.uk's (and some .uk's) I think. I've been out of the UK market for a while and so am not sure about domainer and end user sentiment.
In terms of gTLDs, I'm invested in .NYC where I live/work now, and it feels solid. No swings in the pricing and it's supported by the city government. This
NYC website directory shows the cross section using .NYC. I think you have to take each gTLD on it's own merit and risks.
If I was in the UK opening a bike shop, I might go for a company.bikes gTLD. Why not? SEO? Maybe, but there would still be work to do on a somename.com website to get it to rank well... plus how many bikes am I selling online? Probably none. So if I wanted a memorable website, I could be proud of handing over my company.bikes name on a business card to my potential customers - it might give me an edge in them remembering my business.
I believe that although some gTLDs will die, the mass release of them and registrations over time have slowly been chipping away at .com and customers have options that provide meaning, brand extension and the opportunity to get the keyword/name that they want on the left of the dot, that is out of reach with a .com.