I agree that teaching your kids the importance of hard work is a good thing. However, surely the message you want to teach is not just 'working hard is important because then you'll get more nice stuff.'
First, whilst working hard probably does increase our chances of having a life with stability and nice choices and nice stuff... but it is sure as hell no guarantee of it. Plenty of people work hard and don't get as far as they'd like. You seem to suggest this is the fault of socialist governments undermining the value of people's hard work, but I'd argue that the more significant problems are inequality, the leg-up enjoyed by the relatively privileged, and of course the completely unsolvable issue of luck. The hardest worker does not always get the best job opportunities, earn the most money and have the nicest house. They never will. In fact, the old cliche about 'working smart' more than 'working hard' holds some water I reckon, given that pouring hard work and energy into a specific course does not necessarily bring proportionate rewards.
Secondly, a good life isn't just about stability and money and pools and whatever. Plenty of people work hard and are, quite frankly, arseholes who think their hard work makes them superior to all others. Plenty of people work hard and neglect their families in the process, or don't get round to building a family at all, or to having any fun for themselves. Hard workers can end up stressed, miserable and lonely. Sure, it's useful for capitalism and general human productivity to sell hard work as a value that trumps all others (and to sell earning stuff through hard work as the ultimate way to the good life), but by itself I think this is no way to live. Hard work needs to be balanced with kindness and curiosity; with a desire to connect with others and with space to get to know ourselves. It needs to be balanced with fun.
I still think hard work is important. It does probably increase our chances of building a life we like, and of being respected and trusted and valued by other people. Hard work can help us to grow; to develop new skills; to make the most of hard situations; to be helpful to our loved ones and communities. I also reckon there's a sort of satisfaction that comes from making your house look lovely through graft that just doesn't come from any sort of hedonism. Yes, by all means aim to instil all this in your children. I sure as hell hope they get some nice time off too over the next few weeks too though. I also hope they don't learn to be judgemental and contemptuous of others as well as learning to work hard.