With the intoduction of the electric robot mowers that are trained to mow your lawn and 20 more years of technology, we will start seeing the end of commercial mowing or any mowing envolving human labor... Even now, price wise, they are not too bad, hoovering around the $1k to $1500 range. (figure today a high end honda, not commercial, is over $700) 50 years from now, the old people will be telling their grandchildren how they use to walk behind and ride their mowers. plus gas mowers are under high criticism for pollutants. some cities are pushing to ban mowing all together during certain hrs of the day (smog days) Im not sure who follows military jets, and the last and largest deal with lockheed martin for the new stealth fighters, but the airforce has made the claim that they will be the last generation of pilots to fly, perhaps. And so will this probably be almost it for those who mow. All that is left to do is improve the chip (brain) of the mower, a more efficient and powerful electric engine, and perhaps even a solar charge..... All these technologys will advance well over the next 20 years. Anyone getting into this business today, would be wise to get into the landscaping portion of the business.