Believe that's what will happen to Ryanair (at MAN at least in the next couple of years or so).

As for ground teams, if BA, for example have 4-5 flights a day coming in, a 2-3 hours apart, why do you need say 10 ramp staff when half that can deal with that airline?
All very well having extra, but paying people to sit (on the off chance they're needed) around isn't always good financial sense. A lot might be dedicated to that particular airline so you can't always pull of say KLM in T2 to handle a delayed BA in T3. Sure you could train people on multiple products, which some probably do.

Some airlines do work on the basis that if aircraft A is late and aircraft B is on time, concentrate on the on time aircraft rather than have 2 that are now late.

Unless I'm wrong, I believe Dnata pay at least £1/hr more than Swissport at MAN.
Swissport themselves just lost the contracts for TAP and Transat to whoever (although these contracts do tend to swap around the handlers from time to time). Others may be 50-50.
They've potentially bid for the Emirates contract that is up for renewal, but whether they have any chance against Dnata (aren't they owned by Middle Eastern airlines / groups?), no idea. Good result if they got that, although staff wise, not sure how they would cope.

FR at MAN are switching to a "T25 product" from the 26th March ("new" branded equipment and uniforms - T25 being the turnaround time). Supposed to be a dedicated (Swissport) team who will only do Ryanair; another team only for Tui; another team only for mainline i.e. Qatar, Singapore, Etihad etc. No crossovers so staff should be trained solely on the one product. Lots of recruitment going on, although I suspect a lot of issues with FR when it hits the summer season and all these new staff can't cope.

Slight change of topic:
The Escape lounge in T3. What food do they offer outside of breakfast times? Only ever been in there for the 6:15am or so departure.