until now have not thought about it because it is very difficult for others to cryptocurency could replace cryptocurency bitcoin my knowledge there because bitcoin created as a benchmark to price cryptocurrency.
I dont think that any other cryptocurrency can compete with bitcoin currency do to their so much achievement and success. It seems to be impossible according to the present situation.
If any currency try to do so they required so much time to come on to the level of bitcoin because is not organization which is new made it is established since many year so conclusion of all discussion is that not possible to compete with bitcoin currency rate and come on to the level of bitcoin.
The bitcoin has the largest user community. No other altcoin can match that.