That's where the rise of lower budget indie films come in, as I said at the end of that post. It's very easy for an actor to find roles in lower budget films or TV series that show and develop their range. They may not get a variety of different roles in blockbusters (though it can lead to that), but actors are often praised and expected to have a certain degree of range due to how the industry is now. It's a a far, far cry from where Hollywood was in the '30s-50s, where an actor was expecting to act in a single role and once that was found, pretty much never branched out due to lack of opportunity.
I mean, yeah, if you limit yourself to only big budget blockbusters to the point, maybe, but that's self-limiting and pointless since the industry has evolved to a point where there is more out there than before.