The LH-series RWD cars (like the 300C) and Dodge trucks are very successful sellers....in fact, both are in the top 20 selling vehicles in the U.S. - I highly doubt that they'll stop producing something that's selling that well.
The Fiat stake in Chrysler mainly just means, as analysts have pointed out, that Chrysler will have their choice of a number of excellent compact car platforms that Fiat has introduced in recent years.