They may be filled, or nearly so, on certain routes in the summer, but it's just that, in the summer, and only then in June-August. The problem is flying them around with 130 pax in winter. The other is with regard to load factor is that the new strategy is no longer to simply chase volumes, but to maximise yield. To this end, filling all 212 seats at any price may not be the desired plan.
There are other cost factors in play also: 1 less cabin crew per flight, lower landing charges and airways charges (both weight based) as well as the maintenance and fuel issues.
That said, this debate is fairly moot as the decision is made and at least 4 of them will be going in the spring as the new A320's are delivered.