I know I will upset some people with thsi one, but....
I like cloning of some attractions - particularly the E Ticket rides like Soarin and maybe, one day, Journey from TDS. I go on Soarin everytime I visit EPCOT. I wouldn't be able to do that if it wasn't cloned. Let's face it, even die hard fans like us, may never get to Tokyo. Heck I have been to WDW hundreds of times over the last 31 years, but the only time I went to DL was for the 50th Anniversary. Signature attractions like this need to be spread out in different parks. Why shouldn't Disney spread these out to attract audiences and make the experience awesome for those visitors who will never get to another country, or even Anaheim. Given that these attractions costs 100's of million of dollars, it also makes economic sense for Disney to spread the imagineering costs over more parks.
I also liked going to DL and discovering the differences between it and WDW. It made the trip even more fun trying to spot the differences in the parks and the attractions.
I say clone Journey and any other fantastic attraction from TDL and TDS sooner rather than later. However, the clone should be as awesome as the original, not a cheaper version like Disney has done with some other clones.