I would like to share my findings on minecart system.
Here is the schematic of my arrival station.
First is the idle state where no cart is coming in:

A recycle cart will spin at section 1 as indicated at diagram above in green.
Section 2 is open.
Then, when minecart carries someone come in and land on the pressure plate:

The pressure plate will send signal via redstone circuit to open section 1 and close section 2.
The spinning recycle cart at section 1 will be release to section 2, and will be spinning.
When the guy leave the cart, the redstone will send another signal to close section 1 and open section 2. The recycle cart on section 2 will come over and collect the cart.

The recycle cart, will go back to loop section 1 and the entire system is reset.
I do not draw out the actual implementation as it varies between north/south/east/west facing but the general idea is there. Also, separate booster track are required in section 1 and 2 for keeping the cart spin.
It's all fine and dandy, except we need an effective booster system that will keep the booster cart in motion when the system is idle (as mentioned in my earlier post).
Will test out this system later though.