It wont have nearly as strong post-successor legs as PS2. A few reasons being
1. emerging markets now get the consoles at or near the same time as the main markets.
2. PS3 released 5 years after PS2 while PS5 is releasing 7 years after PS4.
3. PS4 will never get close to the price that PS2 got to.
2000 and 2006 (2007 in EU) So not 5 years