No way, just because bitcoin is making upgrades doesn't mean alts will go anywhere. Granted, a lot will probably die off, but there are still better options than btc.
Yes, for now, and only for niche settings. And this is bound to rapidly change with LN, RS, and other implementations. That's what this thread is about.
Ethereum also announced many changes that will raise its value in the near future. There are other altcoins that will definitely live in the coming years.