Es long as they bring more profit than eats money for energy consumption it will be bought.How much longer will these dual L5520s make sense to colocate/offer? At their current market price, they cost more than a brand new E3 after 18 - 24 months. With E3 v1s starting to come to market, I don't really think it's a good investment.
Currently you get on ebay DL380 G6 with 2x L5520 and some other stuff for around 300 to 400€. This is nothing for this compute power and features. Add a 10G NIC and 64 or 128GB RAM to this nodes and you will have nice VM nodes for the next 2 years.