Rental is still falling in SG, so there will be direct competition from SG for rental. A 2-bedder can be rented from SGD $3k in SG, so the rental of this type in Puteri Harbour and Medini could be from SGD $1.5k to be attractive. Any higher is challenging. It is better for an area to be vibrant to sustain the F&B, retail and theme parks, and this will support higher rental.
In fact sgd1.5k is challenging for johor, for Singaporeans to escape high cost living, RM 1.8k is most acceptable, they don't need a far flung marina yatches setting.