PR statement from 2011, at the end it mentions that Eastern Europe, Middle East, Southeast Asia & South America are the primary markets where it is still selling well.
PS2 legs were mainly due to these regions, PS4 did not have this issue of a super slow start and explosive later growth in these regions so PS4 legs coming anywhere close to PS2 is not happening.
Eastern Europe isn't surprising when these are the dates of attaining EU membership:
2004: Estonia, Latvia, Lithunia, Poland, Slovakia, Slovenia, Czech Republic, Hungary
2007: Bulgaria, Romania
Every country that has joined the trading block has experienced accelerated growth in wealth due to free trade across borders and it takes at least a couple of years until it really manifests in the spending power of the average citizen, hence the late blooming of the PS2 in Eastern Europe. Like you say, the PS4 could take advantage of that right from the start.
Other regions have also experienced general economic growth since the PS2 days, hence why the PS4 has been officially available in more than 120 countries within one year of its launch.