Just read through some of the posts above, and I completely agree in terms of why replace a electric loco/train with something that would do the exact same, yet seems to be the only solution to the already capable loco+dvt and up to 10 MK4's by starting to put them out of service 4 to 5 years from now, even though they have more life in them for many more years to come. Just seems and sounds illogical to replace them so soon. Heck even the 'Skippers' (I think the right nickname for the 142/143/144 Railbuses) are going to be around some time yet, maybe even a year after the 91's are due to start to be withdrawn.
But anyway, back on topic. Ahem. One thing that determines even the VTEC 91+DVT set, is will it finally include etched parts and Head/Tail lighting to modern standards of now? Maybe not, but surely there is still a market for OHLE loco's etc in both RTR and kit build? Not hating on the current 91, but the price is still quite steep for something that is as old as the real counterpart itself. I do hope that Hornby gives the 91 and 90 something of a tribute of upgrading them before they all disappear off the mainline in about 5 plus years time.