you could be right about anonymity being a niche feature, altho i'd bet you're wrong on this. the vast majority of Bitcoiners, i believe, want increased privacy. as far as faster tx's, you are definitely wrong on this. ask anyone, "would you rather have your tx confirmed in 1 min or 10min? every single one of them would pick 1 min.
point being, when the block subsidy in MC runs out in 2140 or sooner, the SC will be competing with the MC simply on tx fees but the SC has the added advantage of faster tx's and/or anonymity. which chain would you rather be on, especially if you were a miner?
I'd bet the picture your are painting of current BTC user does NOT represent the vast majority of future Bitcoin holder. Privacy should absolutely be user-defined in my opinion and the mainstream, right or wrong, has little need or want for anonymity.
As far as faster tx, remember that they come at the cost of lesser network security. I don't believe you can simply provide faster transactions on a POW algorithm without a tradeoff in security because if that were the case then Bitcoin would've had it by now.
you are seriously twisting your argument to support your claim. who knows the future? to assume there will
be any innovation that gets added to a SC on top of a MC clone that won't make it more attractive to migrate to is asinine. that's what SC are for! and your security argument is a logical fallacy in that it is perfectly reasonable to expect that faster tx times will be achieved in the future that doesn't effect network security, point being SC's coupled with that innovation will obsolete Bitcoin.
and the whitepaper even acknowledges this migratory effect. why won't you?