Places come and places go. It seems like there's always hand-wringing about whether various events mean the end of life as we know it, or not. I'll miss some of the places that are closing. Others won't bother me in the least. A ton of new places will open; some will be awesome, some will suck, and many, regardless of whether they're good or not, won't make it past the first year or so (I don't envy those of you in the food service industry). There will also always be overrated places that do great business but just as many underrated places that do just fine too.
Can I consistently find great lunch options for under $10?
Can I find great everyday dinners for under $20 (sans drinks)?
Once a month or so can I splurge and spend $100-200 on a really great meal for two?
Can I do all of these things while exploring new (to me) establishments and new (to me) cuisines and not just relying on the same dozen places?
As long as I can keep answering yes to those four questions, I think the Portland food scene is fine for me. Until the whole town is overrun with Applebees and Cheesecake Factories, I'm not going to be too worried.