The point you make is very laudable but I fear that we may become too mawkish and, perhaps, devalue the memorials we already have. The Cenotaph has grown beyond its original purpose; the commemoration of the souls lost in the, then, Great War. We now remember those who have given their lives since then; be it the 2nd World War, Korea, Malaya and so on. The National Arboretum is a living memorial that already exists and has the flexibility to grow as discreet events dictate.
There is a modern trend not to mourn in our traditional British way. Witness the near hysteria at the funeral of the Princess Diana and the myriad roadside “shrines” of flowers, teddy bears and the like. We are who we are and we must think rationally and carefully about how we do things. Maybe tradition is old fashioned but our Military is founded on it.
For my part, for what it’s worth, lets keep what we have and build on that. Maybe we should leave the breakaway movements to the foreigners.