Then the real problem that ought to be solved is too many people boarding with too many large bags.

The size of some 'carry-on' baggage of late is getting comical - I've seen some as large as my checked baggage. And then some airlines allow an additional 'personal item' (laptop bag, handbag, etc) as well as the larger carry-on. Add to this an unwillingness to place anything under the seat in front (presumably to safeguard their limited legroom), and you're left struggling to find a place for your modest bag if you board last.

It's just selfishness, pure and simple, and it won't be stopped until the airlines enforce sensible limits.