I love the Nemesis music (yes
@Rick it still blast out as soon as you enter FB and prominently by the ride and is as awesome as it ever was), one of the best tracks on park. The last thing Merlin need to focus on is tinkering yet again with music, one of the few things that isn't wrong with their parks.
If any parts of layout will be changed, it'll be very slight and not noticeable to most guests for foundation and maintenance reasons only. No need to change any other element of it. Why would anyone want to tone Nemesis down? Would defeat the point in the ride and it's original design.
A retrack, fix the monster theming and a system installed to return the red water would be a starting place for me. I want to see some work done on the pit by removing some of the tatty weeds so you can see the theming by the turnaround and the bus once more. A general clean and maintenance around the pit, station, queue line etc and I'm happy. No need to reinvent the wheel with Nemesis otherwise they might as well just rip it out and chuck something cheap it it's place. It needs restoration not changing.