One problem is that the Vulcan costs a huge amount of money to book for an airshow/flyby. There are plenty in the airshow/warbird community who are relieved that the Tin Triangle is retiring because it is starving the life out of many of other 'acts'. Everyone agrees that the Vulcan is a big public draw, but in it's 8 years of flying it has meant that organisers either can afford to book The Vulcan, or perhaps 4-5 other things instead. The Hunter display team has gone, Miss Demeanor is up for sale, and things like the Sea Vixen only seem to get booked when the Vulcan drops out. If the Vulcan had continued for another 10 years then we may have had nothing else left by the end of it's time.
The same accusation gets levelled at the RAF and the Battle of Britain Memorial Flight. AIUI it's much cheaper to book the Lancaster than Sally B, and similarly the BoBMF Spitfires are cheaper than the various privately operated ones. I know the Coventry mob are trying to get a Shak airworthy - I wonder if that will ever really be commercially viable.
There was a time not that long ago when there were two or three big airshows every weekend from May through to September - I once attended 50 in one year. Now we have less than 10. This year it's really only Cosford, Yeovilton, Fairford, Culdrose, Duxford, and a load of seaside shows. There just isn't enough money to go around, and if one 'big' act takes all the money that is available, then it can only get worse.