You do know that Alaska has nearly a million people living in it, right?
They're still about 300,000 shy of the million mark actually. At their current growth rate it will still take them another 25-30 years to hit 1 million. I suppose that still puts them within the 50 year parameter of this poll but I think it may be a bit premature to say that Alaskans number "nearly a million."
North Dakota, Wyoming, and Vermont are the three I think have the greatest chance to remain at 3 EVs for the foreseeable future. The others all have a somewhat reasonable shot at hitting 4 EVS.
As a historical aside, ND lost its 4th EV after the 1970 census, SD after 1980, and MT after 1990 so it would be kinda interesting to see them rebound. As for the other states, Vermont had at least 4 EVs up until the early 20th Century and Delaware had 4 EVs once for a single decade after the 1810 census. Alaska and Wyoming have always had the minimum.
As a second aside on apportionment in general, I think the wide population disparity between our 3 EV states should be sufficient proof that we need more representatives. I think Congress should strive for a nationwide 1:500,000 representative to resident ratio after each census. That would give us about 600 members of the House based on the current population.