All I have to offer here is my own limited experience:
Regular hardshells should not be checked! Not only are the latches weak, the case itself is weak. I checked a standard Fender molded case once, brand new, first time ever. I duct taped all the latches, and all the way around the case. Came out on the other end with one completely destroyed latch, and several large holes in the case.
Anvil types cases are good; the latches are recessed and it would take a serious impace to puncture one. Mine's been around the world multiple times, and while it's not pretty and it's a little twisted, nothing's ever been damaged. Always tape over the latches, even if they are recessed. Maybe the tape will be breached, maybe not, but it sure can't hurt.
I'd like to see a modern interpretation of the anvil flight case, along the lines of what some guys are making for double basses. i.e. lightweight composites, light alloy hardware, air bags, wheels, etc.
Also, I'd really like to see more basses built with bolt on necks and threaded inserts, and cases to match so that a bass could easilly be packed into a much smaller case or bag. That way it could go as carry on for sure; a soft sided case with an internal from, that looks like a suitcase. Also, the big anvil cases don't fit in a lot of cars. Ever ridden with one in a cab? Anvil case on your lap, head/small rack next to you, and the 410 in the trunk... No fun.