Why do you expect montly season tickets to get replaced? More importantly, why did the SRA expect monthly season tickets to get replaced back in 2002?
The National Rail Conditions of Carriage (NRCoC) and TOCs Passenger Charters state that Monthly and longer Seasons will be replaced if lost or stolen (subject to conditions). The NRCoC states that other tickets will not be replaced.
As
Old Timer says, the SRA simply defined that the replacement terms should continue as under BR.
I suspect the reasons why weeklys have never been replaced was down to cost. Now that weeklies for even a normal commute can be up to £100 (and more) I think the cost/benefit analysis has changed somewhat.
A single ticket can cost over £100 too, but isn't going to be replaced. They can be though, if you have travel insurance - I would think the same would hold for weekly seasons.
The cost argument doesn't really work for me - whilst tickets are more expensive in real terms, you're still only losing (at most) a week's travel, as would always have been the case.
As to why I think they should be replaced, its because of the nature of the ticket. It is person specific, so if the TOC is doing its job properly, it should not be able to be used by anyone else (same with a monthly/annual).
I would love to see far fewer automatic barriers and more manual ticket checks. However, even if this happened, it's simply not possible for a guard/inspector to check that the ticket and photocard match for every journey - they're going to be more worried about people with no ticket or invalid tickets. For a weekly ticket, the chances of it being picked up are vanishingly small.
Also, many TVMs will issue weekly Seasons with no photocard number on. If you could get a refund on them it would be an open invitation for fraudsters.
Why do you think it is unreasonable to expect this?
I personally don't think it's hugely unreasonable, but it wouldn't be free and it's not in the TOCs interest to do something which would (or could) negatively affect their profits. The DfT is extremely unlikely to do anything about it either, as (a) it would be very low down on their list of priorities, and (b) the TOCs wouldn't like it.