Agile - is mainly not about programming, but about growing clients idea to real product. Planting it from small seed to product. Supporting all changes to move forward in modern environment. One of the oldest Russian hospitals catalogs is totally redone by us - and every day its getting better and better.
Some of sites I've developed long time ago are still online and doing their duties without breaks and any big changes. You don't need to be modern if all you need is just work as you are. Support and help clients anytime they are in trouble - and your sites will live healthy and happy.