No. I'm sorry if I wasn't clear. The beautiful thing about the Roth conversion is the ability to reverse (recharacterize) any time up until you file the tax return, including the 6 mo extension.
Specific to my Roth Roulette concept - this means you can make conversions to multiple Roth accounts, and at tax time keep the ones that are favorable to you, recharacterize those that aren't. The multiple (new) accounts are required as the gain of loss is based on the whole account value, not just the asset you converted. So you literally take $10K in an ETF or single stock and convert that to a new Roth, another $10K in cash to another new Roth, etc. At tax time, you get to decide what's worth keeping.
To give you an idea of the value of the conversion, 2 personal anecdotes:
My sister is disabled, collecting untaxed workers comp, and started with a 401(k) worth about $150K 20 years ago. When the Roth was introduced in '98, I saw the unique opportunity to use the conversion to take advantage of her "zero bracket", the sum of her standard deduction and exemption. Each year, we converted some IRA money, but stayed under the threshold where tax would be due. By now, it's all converted. Roth money with no tax due, ever.
My father in law died 12 years ago, and I took over my Mother in Law's finances. In her case, I used the conversion to "top off" her 15% bracket each year. In this case, I convert to IRA, but at tax time, when I have all her exact numbers, I recharacterize enough to get her taxable income right at the 15/25 line. i.e. The last $100 was taxed $15, but the next $100 would have been taxed $25.
The 'roulette' strategy may be more effort than you feel is worth it. On average, one year in 3 is a down year, and you avoid paying tax on $10K with only $9000 in the Roth to show for it. In up years, tax on $10K but more in the Roth. By separating into asset classes or individual stocks, you can change the potential returns. Even in a down S&P year, your Apple stock might be up, or in that year, the cash is what you'll leave.
Last, my examples of looking at marginal rates will certainly help. If the conversion sends her into a higher bracket, the recharacterization can fix that, and just convert again next year. No need to pay 25%, when
15% will do.Whatever you decide, I hope this long-winded answer helps you understand why Roth has great potential, far greater than any "all or none" discussions ever address.