I am not sure there are less testing hours than before, but they are more evenly spread: before, only the "rich" teams could afford private testing sessions, now all the teams benefit from them. Also we have to consider there are still some official test prior to the season, and during the year, again, enjoyed by all teams. With 22 GPs on the calendar next year, (and Liberty wanting 25 !!), I don't think there would be enough time available for testing, if the ban was lifted. Only the well-heeled teams would be able to afford a dedicated testing team, with development engineers, and crews on call with drivers to conduct them. Again, not all teams have a private track or can fly at short notice to South Africa in the middle of winter. Although it is still a bone of contention, let's not forget that the teams themselves welcomed the restriction, on the ground that more races could be added to the calendar it testing was restricted. The trade-off was that the teams get paid more than before. As Ecclestone rightly said, you can sell races to TV channels and advertisers, but you get nothing for testing !