Yes and No - there are just too many variables to predict anything. Many airlines will not count helo time at all - they don't consider it real flying. However, as a helo pilot, you can come back and get a tour instructing and build up thousands of T-34C hours.
The airlines are not what they used to be. Many of the traditional "legacy" carriers are in deep trouble and are being forced to take major paycuts and work rule adjustments. Right now, I tell everyone to stay in, take the $25k per year bonus, and get your retirement. However, all of this could change in 5 to 10 years. Also, picking the "right" airline is just as much a crapshoot as selection at primary. I've got friends who had thousands of multi-engine PIC turbine time who went to United, American, etc and are now furloughed and unemployed. Meanwhile, my company is growing and buying Airbus 320's. It really is luck to a large extent.