They'll continue to belt other teams. Munster will pick up most of the load Cronk carried and a 20 year old named Brodie Croft will slot into the halves. Croft played a few games this year during the Origin period and at just 19 he already looked like he'd played 50+ first grade games with his kicking game and steering the troops around the park, he's a natural play maker and that kid's going to be something special. Then of course they'll still have Belly-ache as their coach, he is the best in the business.
Now if you asked the same question at this time next year Ant, the result would be different. They'll very likely lose both Smith and Slater to retirement then, and Bellamy will be off-contract. Those 3 won't be replaced easily...