"...your 1G iPad will become little more than an expensive paperweight as new apps and updates to your existing apps start to require iOS 6"
Not updating aiPad 1 will not amend this problem... Sorry.
Having an unpatched tablet connecting to all kinds of... "wild" and untrusted networks (as tablets are wont to be) seems a bit risky.
"...your 1G iPad will become little more than an expensive paperweight as new apps and updates to your existing apps start to require iOS 6"
Not updating aiPad 1 will not amend this problem... Sorry.