C'mon guys,
We can "what if" till the universe contracts just before the next big bang and we will not solve the issue of "What if groups.io falls down and drops dead".
That's really? your questions.
Forget about "What if Mark? ________ ?"? You are really worried what you will do in place of groups.io.
There is no obvious answer that I am aware of but also I'm not searching and neither are you for that answer.
I'm not searching for the? answer because I'm sure that groups.io will attract competitors in relatively short time. It should become obvious to savvy tech people that groups.io actually seems to be draining the (Yahoo) swamp and with thousands of groups ready to flee Yahoo prior to its' groups' group crashing and burning a viable groups.io competitor seems almost a sure thing to happen.
I'm simply going to run my groups, read this and some other forums, contribute to some bug reports and not worry?
I think that we should all concentrate on what a benefit we have here and start to be positive about it.
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Bob Bellizzi
The Corneal Dystrophy Foundation