The power already exists for local authorities to issue an EDMO (Empty Dwelling Management Order) so JC isnt exactly talking nonsense. Unfortunately, the procedure takes time.
Yes these poor victims need housing immediately, but I do not believe "requisitioning" legally held property of others is the answer. That's a slippery slope.
I certainly do not know what the answer is and it appears neither does JC. Given that feelings are understandably running high, he would be better advised to collaberate and come up with a practically workable solution rather than making daft political comments which will only seek to increase the divide between the haves and the have nots.
This building must have been insured by the landlords - no one appears to have mentioned what, if anything, the insurers are doing about this.