I think I would actually like to see their return as well, yes they were difficult but a great challange.
I think with the Beth / obsidion engine I personally would love to see what they looked like and what abilities they could be given.
I just don't see the reason for it though.
Why can't they finally rest?
Why can't something
actually die out in the fallout universe? (Super mutants and Enclave for example... <_< )
I loved wannamingos but I'd hate to bring them back.
If they went extinct then they went extinct.
And bringing them back now would solely be for fan-service, which would be crap writing and game design.
*sigh*
I miss those tentacly bastards, I really do.
But all good things must come to an end. /Put's on some Nelly Furtado.