YES!! I've long thought the tax rates on cap gains should be extremely progressive with holding time, ranging from 99%+ for sub-second holding (HFT) to sub 5% for decade+ holding periods. This would also effectively eliminate the utility of basis reset on inheritance, since the rate for multi-decade holding goes so low.
Also a great idea I saw recently is to treat any encumbrance of a capital asset as a realization event. For example, early investors in a company holding stock may have $millions in unrealized gains. Those gains are 'realized' and taxed on sale of the stock. However, if they take a loan using the stock as collateral, it is not taxed because there is a matching obligation to repay the loan and the stock ownership doesn't change (except in a default). Such loans should be taxed as a realization event, since they are pledging the stock at its current value, not its comparatively microscopic original purchase value.
Also a great idea I saw recently is to treat any encumbrance of a capital asset as a realization event. For example, early investors in a company holding stock may have $millions in unrealized gains. Those gains are 'realized' and taxed on sale of the stock. However, if they take a loan using the stock as collateral, it is not taxed because there is a matching obligation to repay the loan and the stock ownership doesn't change (except in a default). Such loans should be taxed as a realization event, since they are pledging the stock at its current value, not its comparatively microscopic original purchase value.