No. Sea-level is rising, much of Lagos will be underwater. So they'll have to relocate. It's slow so more people could live there for the next few decades, but mega-construction not be a wise investment.
Demographic projections have a lot of inertia, but sea-level rise (transfer of heat into the deep ocean and icecaps) has even more inertia (in my model i explore both, although sorry SLR is out-of-date and not yet detail at city level, but the inertia is there).
