Yes Citrix is dead, yes Tibco is dead, the cultures are dead, the employees have been treated horribly so far, and the future business looks like a financial conglomerate and not cozy tech companies.
Putting that aside, TK does have a history of building businesses like they laid out. and if CSG avoids bankruptcy and can roll up a lot of other ex growth enterprise software it would be very lucrative (for PE). There is a route to going public again if he builds Broadcom 2.0.
What are the odds that it succeeds ?