Not really. Its the exact same thing. Kinnock/Prescott/Blair purged Militant. Now Militant, or whatever Corbyn followers gather under, (Progress?), want to do the same. I find it an unattractive characteristic.
Reclaiming their own party? If you put forward policies and the majority of members agree and approve isn't that democratic?
Why wouldn't the right of the party go all SDP, is it because they would be out of a job?
Politics has polarised, the left concept of socialism, though still to the right of its historical beliefs at the moment, is a reaction to what is tantamount to a class war, the right move to the right even more as a reaction to that. One of the main reasons the lib dems are a spent political force.