I don't think it'll become meaningless in any way, but it should not be taken for granted that lightning will become the dominant L2. Technically, Fedi may be more desirable to more people than lightning, and something could be created in the future that is more usable than both of them.

If anyone is unaware of lightning's shortcomings (mainly channel balancing maintenance) then they typically are overly excited at first and then harshly disenfranchised when they come to understand the challenge. That's the majority of the FUD we see, IMHO.