And as alt coins that are trash are exposed as trash over time by no usage as a means of exchange they will be removed after people lose interest in them.
NVC, TRC, and PPC (we'll see about the last one).
If they offer nothing new they may face challenges
I suspect TRC is a pet coin of well you figure it out.
PPC however I think will take the crown from BTC.
I am not sure about LTC 1 to 1.
On one hand it has speed, and asic resistant so it will have much more broad based appeal until and asic comes out for it..
LTC may face 4x chain bloat over BTC though....
Feel free to correct me If I am wrong on any point