No, but it's nice to hear solutions!
I am not sure yet another level of fares should be introduced. After all, isn't our fares system complicated enough?
We already have Super Off Peak tickets on the ECML, GWML and WCML (LM), so it's not making it any more complicated I'd say. As long as they are relatively standardised across the board, that is.
Virgin could hardly claim that they aren't introducing an OPR because it would be too complicated, what with their SVH and Super Off Peak Travelcard (which, er, must be bought in advance).
Fare avoidance? How is it fare avoidance?
Because they're avoiding paying the full Anytime fare?

OK, tongue out of cheek time - Virgin would like to claim that their hugely restrictive (on certain flows) Off Peak tickets are thus restricted in order to manage demand, whereas in fact it exists to encourage customers to buy Advance tickets on "peak" trains which would be practically empty without these Advance fares.
The fact that Virgin have an offer whereby people holding an already discounted Off Peak ticket may travel on any train shows that they view the Anytime fares as almost a penalty for not booking in advance, and to get the maximum possible revenue from business travellers who need the flexibility.
I think demand management can be done using a two- or (probably better) three-tier system of flexible fares, and that this is far better for the passenger. The current overcrowding/underutilisation problems stem from the enormous price differential between Anytime and Off Peak fares, and the fact that Off Peak begins so late that there has been an accumulation of wannabe travellers during the morning.
Of course, this is unlikely to happen whilst the intercity TOCs favour Advance fares - not because of managing demand, because AP tickets are not used for this IMO, but because the revenue allocation from Advances is more favourable. I'm not knowledgeable enough to comment on how the system could be improved, but I feel that promoting flexible tickets in most circumstances would benefit not only the passenger but the industry as a whole.
<end of ill-informed ramblings>