There are zero reasons to assume Bitstamp is insolvent.
What is happening though is a rather over zealous KYC/AML policy which asks rather probing questions such as proof of funds. This in itself is not a problem IF its in the TOS and people can expect it.
Whats not okay is people selling coins thinking they are verified (it even tells you on your account you are verified) and then having their funds held hostage until they pass all the procedures.
Overall its just about making things clearer but they are likely just covering their ass. Naturally people jump way far ahead of themselves and start making wild presumptions.