Its great that other clubs have won cups, gives us a bit of hope, but for every Portsmouth or Man United, there are roughly 100 professional clubs, poor and rich that havn't won it that year..
In 10 years, 6 teams have won the FA cup out of a total of nearly 1000 league clubs. Your pointing out the one club that has succeeded against the bigger clubs in that competition, for me simply goes to show how much luck is involved. How many winners other than Portsmouth were smaller than us over the last decade? none.
We are also bang on form in terms of the League Cup because we have never won it. In fact, we've only reached the semi's 4 times so historically, this is a rich vein of form as one was this decade

.
I also cannot see why winning a trophy in 1933 means we should surely win one this year.
Success for me is progress, because unless we progress, we'll be relying on luck and Portsmouth spent a lot of money and paid a bigger price for their luck than anyone would want to pay.
IMO it would be great to get some money and be one of the clubs that win regularly because they are well financed and hit regular CL spots. It would be even better if that finance came from achieving 4th spot, getting to the group stages a couple of years in a row and progressing, so whilst Wigan hurt and City didn't make up for it at the time, it may yet if the start of something good is still to occur this year.