Bit naive to think that you could stay separate from the current pure scene just by being on 1 def accs - plenty meds can hit them at most popular fighting locations, a lot of people will have 1defs sitting unbonded. Unless you plan to do cwa only or sit at fog in a non pvp world it'll make little difference other than people not being able to use 107cb meds.
I think most current or former pure clanners would like the idea of 1def being the standard, but at this point it wont achieve anything other than making people quit and making others make low level tanks.