If UBS dump the IB division (which is being made more autonomous), then it becomes a retail bank again. It's still the biggest wealth manager in the world.

And UBS are still well capitalised.

Lehman, Bear Stearns and Merrill don't have these other divisions (I'm sure I'll be corrected if I'm wrong)

Frankly, if UBS did go tits up then you'd be close to using your CHF notes to w1pe your bum and buying your groceries with toilet roll.
The combined assets of CS and UBS are 9 times Swiss GDP.
Swiss banks and GBP