Using single microcontroller I/O to enable/disable two transceivers
Yes, that should work fine.

Here are some things to check for, the next time a question like this comes up:


Make sure that the input pins are high-impedance.  They almost always are.  Two exceptions are: an optocoupler where you are driving an internal led, or a bjt transistor input.  In either of these cases, the datasheet will mention the required drive current.  Parts with high-impedance inputs don't draw any significant current.
Make sure the pins are only inputs. I'm working with an IC that has a Reset input, which is also an open-drain style output. You don't want one of the sensors to drive the other one :)
If you are wanting to switch the line on and off rapidly, then you'll need to consider the input capacitance.  But, not for this example.


Good luck :)