I think he is relaying what the title is.. since if the price is going to be stable it will be the same as other currency or real currency like usd..
That the movement of the price is stable and he will be choose altcoin because its giving more fluctuate and they can sell their altcoin than bitcoin. due to slow movement or bitcoin is very stable..

i think value may is important to traders as they are earning from the flux of values of bitcoin. so we cant say that there would be no problem for traders when the value of bitcoin stays stable. maybe for alternative coins that may help the traders to earn from it.

Yes I will keep using bitcoin in fact having a stable price will be great since I will not have to worry to leave my coins in my wallet for a long time and that the price tanks or something so it will be one less thing to worry about, and that will probably incentive business to accept bitcoin and keep the bitcoin instead of selling it right away.

Yes, of course I will use it because i use bitcoin for my ease rather than its price if its price become stable..

Achieving a stable price for long period should not have a negative effect in the bitcoin economy, on the contrary it would be very beneficial to impulse a better adoption for more economic agents. But a stable price does not mean a total lack of move in the bitcoin behavior, a stable price also involves less volatile pumps and dumps, not beyond 2-3% in a daily basis, as fiat currencies.