Updated, corrected edition inclusive of errata was the sales pitch for 3.5. I'm only a casual observer since I don't play 4e but the level of errata seems to be greater than what was used to justify 3.5. (It may not be, it may be it's just better communicated...)
Numerous Internet prophets have declared there will be no 4.5 edition and, if memory serves, a WotC employee or two may have said the same. So with a large(-er?) amount of errata, greater visibility via the DDI, and a promise of no 4.5e -- yeah, I think it could hurt the line. Depending upon the severity of the impact, I could see where it could eventually impact the life/longevity of the edition as well.
Numerous Internet prophets have declared there will be no 4.5 edition and, if memory serves, a WotC employee or two may have said the same. So with a large(-er?) amount of errata, greater visibility via the DDI, and a promise of no 4.5e -- yeah, I think it could hurt the line. Depending upon the severity of the impact, I could see where it could eventually impact the life/longevity of the edition as well.