It would be nice to have some other Nigerian carrier introducing newer aircraft, but as Rani says I don' think that's all that's needed to take B3 et al to the next level.
I think the problem with Nigerian aviation is that the airlines themselves haven't taken the initiative to introduce new technology unless it's been forced on them by government - not just in aircraft, but training, systems etc. During the recent unfortunate events with B3, an airline I'm closely acquainted with was asked by the authorities to help supply pax name lists as the one B3 had was not reliable - why?
Good luck to B3 whatever aircraft they choose. All the better for the airline industry as a whole. Hopefully, VK's arrival and B3's fleet modernisation will give everyone else a kick up the backside.