Yes, the US is well served by LensRentals to which there is little alternative outside of the US. I would love to try lenses first or to rent esoteric ones for workshops or playEF lenses in the United States are not very difficult to find. They are litterally everywhere or in most rental houses for rent or purchase. They may be "discontinued" on Canon's website, but will be available for decades. Many Cine cameras are EF mount. Don't see this changing in the near future or for quite awhile. A long while
The US market is also big enough for lots of second hand lenses although it probably suffers like Australia in that sellers are spammed and ripped off by fake buyers and money transfers. I will only buy/sell now in person and in cash unless the buyer takes the risk on transferring the money first and is in my account before I send it. I talk to them first, show it being used and photos packing it and tracked shipping. Never had a complaint yet. A local Canon 5 year warranty is also helpful for the second hand market.
EF lenses will be available in some form for a long time but new EF lenses will be hard to find... and I believe discontinuation is in the near future for at least some markets.