I don't particularly disagree with the OP's view that things are somewhat mundane currently - a little depressing even. Not a great deal happening in the immediate future, meanwhile freight is on the decline and many "proper" locos and the likes of HSTs and 225s face uncertain futures and are being replaced in the main by new trains which all look (or are) the same...
On the other hand, we are near start of most probably the biggest investment in railway infrastructure and rolling stock this country has seen since the railways were initially built. Crossrail (a huge engineering feat and the biggest ever in Europe) is well on the way, HS2 will most probably happen and be on-going for the next decade or two, then Crossrail2 / HS3 etc. On top of that, there's IEP, new TPE LHCS, brand new Caley Sleeper stock for the first time in 40 years, DRS buying brand new innovative locos... etc. etc. In the slightly longer term, I reckon there's a quite a lot to look forward and it'll be far from mundane.