My feeling is that it's a bad idea for the following reasons:
- it's an artificial speedbump to shorting, a valuable price-discovery mechanism
- without a comparable 'downtick rule' to even the playing field against bull raiders, it is clearly not market-neutral
- it diverts attention from the serious problem of NAKED shorting, which had much more to do with the rapid selloffs in stocks like BSC and LEH than the absence of the uptick rule
- it's an artificial speedbump to shorting, a valuable price-discovery mechanism
- without a comparable 'downtick rule' to even the playing field against bull raiders, it is clearly not market-neutral
- it diverts attention from the serious problem of NAKED shorting, which had much more to do with the rapid selloffs in stocks like BSC and LEH than the absence of the uptick rule