I'm another one that would love to see more AC electrics. I have a Heljan Class 86 and would purchase a Class 85 but it is totally the wrong era for me, however good a model it might be. I admire those that purchase models that are not suitable for their needs with the hope that supporting them will lead to models they do require but I do not have that sort of disposable income at present.
As I have mentioned in another thread recently I thought the Class 350 was an odd choice of EMU. Don't get me wrong it looks a cracking model but is a relatively new EMU with a relatively limited area of operation. I would have thought other families of DMU/EMU would have been a better choice - Networker based on Bachmanns 166 perhaps? Or the Mk3s based on their excellent Class 150? I also mentioned in that thread that starting with an older family means they can start selling them in old liveries for which they do not need to seek permission, or use the sales of these to subsidise the reduced margins they might see on newer liveries with royalties to be paid. The fact that they have been around for longer means they are more likely to be of use to a greater section of the market as well.
What I find even more odd is that Hornby released a brand new and up-to-date Mk3 DVT but doesn't have any locomotives of anything like the same standard to use with it. Surely not even Hornby are this short sighted - they must have had plans for AC electrics when that was approved which perhaps never came to fruition. Similarly they must see that the Class 91 doesn't cut it anymore next to the brilliant HST - and considering they've released ECML HSTs in the form of GNER, East Coast (ex-NatEx) and Swallow livery with ER running numbers they must have expected that the purchasers of those would like a new 225 set to go along with it.
I agree with some of the above posters that OHLE may enhance the demand for AC electrics, but as I have mentioned before I think it is far more reasonable to expect those who wish to have AC electrics to run them without catenery, rather than expecting that if catenery was available without locomotives the catenery would somehow spur on the market. Clearly it's absurd both financially and in terms of time to erect catenary on a layout without any AC electric locos, whereas a bit of imagination in the absense of OHLE or a diesel towing an electric loco in an area without knitting is still entirely appropriate (read "easier").
I also agree that it is probable that as the manufacturers run out of new models to make that AC electrics will become the next thing on their list. Let's just hope it's sooner rather than later.