I can definitely see the benefit of getting more trams to run through, they could do with it to increase the amount of trams they can get on the lines as it is let alone with all the new lines to be. Just seems a shame that the route isn't more beneficial in other ways with say more stops across a wider reach across the city rather than just the one by Exchange Square which is only a few minutes walk from other stops at Victoria and Shude Hill.
I guess they are so limited with space though and at least have had Cross St/Corporation St nearly enough pedestrianised for some time now and I imagine Deangate would an absolute no, insufficient space, too much traffic already and so many events.
I'm not so keen on the new trams. They might look a lot swankier but so much harder to get a seat now, even when it's quiet, all standing room with little room to sit and I find they are a lot bouncier on the lines (well from side to side). I don't get the tram as a commuter anymore since I moved but still get them quite often. Definitely don't miss trying to get home when the football was on at Old Trafford!