Change is good in terms of there no longer being a rather unfair monopoly of ATC services at the major airports being provided by NATS.
Like what Ladyatco said, NATS have had an unfair advantage being partly subsidised by government and it is very refreshing to see this is now being broken up just like all modern industries are and should be, into a free market.
You sort of answered your own question too, if all the equipment, staff and service are to remain and continue, why does it have to be NATS that provides this, why not give someone else a chance to perhaps bring more innovation and a different approach in the future.
And no, I'm not a non-NATS ATCO but I'm sure there are a few out there who are also very happy with today's news for the points I mention above and more.