North Korea shouldn't start the war in the beginning, especially from a chinese perspective. because china was preparing its forces in the south to invade and take back taiwan. then all of sudden korean war happened and US intervened, so now china has two options: 1) keep preparing for the invasion of taiwan and take it back before caring about korea, and 2) get the army into korea as soon as possible to prevent north korea from completely dominated by US. China at that time does not have the capability of fighting a two front war (it still doesn't) in korea and in the taiwan strait, especially because china didn't really have a navy. so china chose option #2 and helped korea because at the time it seems to be the best option since china didn't have a navy strong enough at that time anyway, might as well wait for further modernization and stop US from coming too close in the mean time.
if china had chosen to continue the plan on attacking taiwan, then there can be two outcomes: 1) taiwan would be taken back and there wouldn't be and crisis in the taiwan strait today, of course north korea might not exist either and US would have a military base right on the boarder. or 2) PLAN fails to sail across the strait completely and get totally destroyed by the ROC navy, as well as a US military base just outside the door. out of these two outcomes, the second one is more likely to happen since the PLAN didn't have that many ships and all their ships are crap compared to the ROC navy. plus Mao didn't have much experience in naval battles. (the strait is far more dangerous for PLAN than the Yangzi River).
great... now i don't know what my point is... oh well, just see this as some extra info.
if china had chosen to continue the plan on attacking taiwan, then there can be two outcomes: 1) taiwan would be taken back and there wouldn't be and crisis in the taiwan strait today, of course north korea might not exist either and US would have a military base right on the boarder. or 2) PLAN fails to sail across the strait completely and get totally destroyed by the ROC navy, as well as a US military base just outside the door. out of these two outcomes, the second one is more likely to happen since the PLAN didn't have that many ships and all their ships are crap compared to the ROC navy. plus Mao didn't have much experience in naval battles. (the strait is far more dangerous for PLAN than the Yangzi River).
great... now i don't know what my point is... oh well, just see this as some extra info.