Broadcom recently released a dev kit that combines both Bluetooth Smart for connectivity and also 5 MEMS sensors, this seems to me to be a good implementation to bring together these two staples of IoT devices and make development of many new devices even simpler.
There are many connectivity suppliers out there and many MEMS sensor suppliers but not many that can do both. It seems likely that partnerships will continue to be made by these largely disparate groups, consolidation is a very likely future trend.
This is not a place to speculate on which companies are likely to consolidate but there are many good combinations that I can think of.
Broadcom’s release is here