But higher level of popularity = more network effects, more network effects = higher possibility of retaining long term value, LIKE Bitcoin.
Not like bitcoin though. Because it is trivial to create another useless memcoin and replace the old one or at least take its market share than it is to create another useful payment system like Bitcoin.
I believe, if it was possible, a merge mine with Monero would be the best possible choice for Bitcoin.
Merge mining works best with weaker projects that cannot stay alive and secure alone (due to lack of interest) and need another bigger project to stick to and stay alive with its help. Monero isn't like that, it has been capable of attracting enough interest on its own to stay alive and secure so far.