Over time we've seen a number of changes take place within the industry. The last major shift took place when the big vendors left DOS behind and moved into the Windows space. This was a massive undertaking and required a great leap of faith and investment on the part of the software developers. They had to step beyond the old flat file databases and move to relational databases which at that time were a diverse bunch. No core player had come to the top yet (e.g., Microsoft's SQL which dominates today). This shift brought Execupay, Inc., M-Pay, and iSystems to the head of the pack, leaving a few bigger players in the dust along with many smaller players. A few are still trying to get their Windows app launched after 10+ years of off and on development.
Bottom line – I believe that this is the year that a market leader will appear. This year, the leader will emerge
Disclaimer: Yes, I work for one of the three companies, and as far as I'm concerned, we will be the one on top. Should I think or say any less?