I'm not a massive fan of mech myself - or sweeping advance either - but 5th still has legs.
6th will probably hit maybe 2012 or 2013 which would seem about right.
If you really don't like mech, try adding more terrain to the feild. Tanks become less appealing if they can't squeeze between rubble and get immobalised too often by dangerous terrain.
Looking for a friendly wargaming club on the Isle of Wight? Drop me a line.
Sisters of Battle - The Order of Glory Undimmed - 2'500 Points | High Elves - House Cyredeth - 2'500 Points | Bretonnians - The Muster of Sir Jules Estelle - 3'000 Points