In a word No!
There are good reasons for Jet2 to remain at MAN for the brand / balance sheet.
Blackpool will be a useful addition to the network but couldn't replace MAN.
There is sometimes a tendency for fellow LBA fans to slam Jet2 for setting-up at MAN, as if it were being in league with the devil!
I'll have none of this....for once an airline that started ops at LBA and found success was courted by MAG to set-up at MAN....admitedly the way this all worked out was probably different to how MAG envisaged....
The upshot is that Jet2 operate successfully out of both MAN and LBA and if only some other airlines could take a leaf out of Jet2's book (and not use the tired excuse of route dilution / passenger extraction of MAN routes) then LBA might see more variety of operators and routes.