I think the Reebok brand is focusing more on areas where it made its name before Adidas came calling, like footwear and fitness equipment. They attempted to expand into other sporting areas and had some moderate success but as jihado86 said, their kits in recent times were shit. Umbro on the other hand only made their name with football kits, though they did make rugby kits too for a time but there were far more established brands in that so they stuck to football.
I think Nike would be bloody mad to try and kill the brand off, especially with the "Tailored" range getting widespread acclaim for the approach and design of football kits recently. It looks as if Nike are trying to pick off the most marketable contracts in the Umbro portfolio and then casting them adrift with the table scraps. Being from a country whose national team wears Umbro strips, I fear if Nike approached the FAW we'd have crappy template kits, like a "oh you're only a small country, here's a template kit and it's red that'll do for you". I've noticed they got a load of new kit deals in Brazil but only gave them like one kit, and the rest are Teamwear strips with their logos put on, it's bollocks!
Also Nike seem to spend more time advertising stupid gimmicks with their kits, wow their shirts were made with 250 plastic pop bottles. But really the fabric of their shirts now are no different to what they were in 2006 when they started to put a bit of creativity into their kits, before reverting to type.
Hopefully Umbro will stick around as an independent brand, keep the philosophy behind their recent kits and come back stronger without Nike interference. Probably won't happen but you never know.