actually, destroying Konoha would mean Suna would either get more missions(those Konoha couldn't do anymore) or get really messed up with the DaimyÅ disowning the village for acting beyond their boundaries or some shit and either going freelance or declaring a different village as their "official" village.
This even with the Fire DaimyÅ rebuilding the village: it would take A LOT of time to rebuild the village as strong as it was.
Most likely disowning them revoking any support the village was receiving. It might sound like Suna would receive missions if Konoha was out of the way, but the moment after the invasion would be the start of a political nightmare for both the village and the Daimyo.
This even with the Fire DaimyÅ rebuilding the village: it would take A LOT of time to rebuild the village as strong as it was.
To the same level, yes, I agree that it would take time. Rebuilding it to the level that it could operate? All the Daimyo would do is 'recruit' ninja from outside Konoha. If Tea's Daimyo was willing to allow Orochimaru to start an official village in his country, I doubt the Fire's Daimyo would hesitate to recruit missing-nins if he had to.
Narutoverse Ninjas aren't known to be good at making killing appear like accidents. Most likely they actually try to make the killing as flashing as possible, to attract more costumers.
And killing your boss is not a good way to get more costumers.
The Daimyo was the one that put the village in the straights it's in. By ensuring his death and that a 'suitable' one takes the throne would goes some distance to the repairing of the village's situation.
As for making killings look like accidents? It would be better if it didn't, only making sure it looked like Suna didn't do it.