Totally agree. This fear is very strong even in the SG government that they came out to warn Singaporeans about the oversupply in Iskandar properties. Yet, many who have bought their properties there interpreted it as noise. Some even accused the SG government of trying to discourage people to buy Iskandar because it will affect Singapore's economy.
I think that's not true. Singapore does not need to depend on the small handful of people who have rushed to get their properties in Iskandar. We have a population of more than 5 million. Those several thousands who rushed into Iskandar are a drop of water in the ocean.
One very cunning Malaysian agent who works in SG selling Malaysian properties and has recently given talks even tried to twist and turn the situation by saying the government misinterpreted the figures. He argued the quoted numbers are for the greater Johor that excludes Iskandar. What rubbish. Oversupply is oversupply. It doesn't matter how much. If you have 500,000 properties coming up in Iskandar, even if you remove 200,000, it's still oversupplied! And it doesn't matter if it will come within the next 5 or 20 years. It's still oversupplied, just a matter of how bad is bad. Many don't seem to get this fact.
The scariest part that will come to haunt the commoners who bought their Iskandar properties is when 20 years or more later, they realize they have paid like S$500k or more with bank interest and everything included. But they are stuck with a very run down condo that no one wants and goodness knows how much RM will be by that time. Imagine what half a mil SGD can do. It can provide your kids with education, family with good lifestyle, etc. If you have the money to throw away just like that, then of course it's a different story.
The rich and those who can compare will know Singapore is a league on her own. I have a handful of junior colleagues who will gladly pay S$400-500k to live in a peace of mind in a HDB flat. I did test them and it's totally unthinkable for them to move to Iskandar for many reasons. For the same amount of RM1.2-1.5 million, I believe they can get a super spacious home, the highest floor, see whatever water from Puteri Harbour and all that. But none will think of that. We are very very far from dreaming Iskandar to be an extension of Singapore.